Small practice. Bright discoveries.Explore the free starter collection
worksheetstudio.
Sign in
Back to worksheets
MathsAges 16-18

Circle circumference & area

Use π ≈ 3.14 and radius r to calculate the circumference or area of a circle. Review suitability for your learners before teaching.

New variationTry interactive challengeBrowse templates
Age band:Ages 13-15Ages 16-18

Choose “Save as PDF” to keep a copy. Use your browser’s paper setting for A4 or Letter.

Worksheet StudioPractice pack · Ages 16-18

Circle circumference & area

Take your time. Show your thinking.

  1. 1. A circle has radius 20 cm. Using π = 3.14, find its circumference.

    20 cm · 3.14 · Circle circumference & area

  2. 2. A circle has radius 4 cm. Using π = 3.14, find its circumference.

    4 cm · 3.14 · Circle circumference & area

  3. 3. A circle has radius 3 cm. Using π = 3.14, find its circumference.

    3 cm · 3.14 · Circle circumference & area

  4. 4. A circle has radius 11 cm. Using π = 3.14, find its circumference.

    11 cm · 3.14 · Circle circumference & area

  5. 5. A circle has radius 20 cm. Using π = 3.14, find its area.

    20 cm · 3.14 · Circle circumference & area

  6. 6. A circle has radius 14 cm. Using π = 3.14, find its area.

    14 cm · 3.14 · Circle circumference & area

  7. 7. A circle has radius 14 cm. Using π = 3.14, find its circumference.

    14 cm · 3.14 · Circle circumference & area

  8. 8. A circle has radius 15 cm. Using π = 3.14, find its area.

    15 cm · 3.14 · Circle circumference & area

  9. 9. A circle has radius 5 cm. Using π = 3.14, find its circumference.

    5 cm · 3.14 · Circle circumference & area

  10. 10. A circle has radius 10 cm. Using π = 3.14, find its circumference.

    10 cm · 3.14 · Circle circumference & area

  11. 11. A circle has radius 15 cm. Using π = 3.14, find its circumference.

    15 cm · 3.14 · Circle circumference & area

  12. 12. A circle has radius 8 cm. Using π = 3.14, find its area.

    8 cm · 3.14 · Circle circumference & area
12 questions · Seed 51 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 16-18

Circle circumference & area

Answers and reasoning. Review before teaching.

  1. 1. A circle has radius 20 cm. Using π = 3.14, find its circumference.

    125.6 cm

    Circumference C = 2πr = 2 × 3.14 × 20 = 125.6 cm.

  2. 2. A circle has radius 4 cm. Using π = 3.14, find its circumference.

    25.12 cm

    Circumference C = 2πr = 2 × 3.14 × 4 = 25.12 cm.

  3. 3. A circle has radius 3 cm. Using π = 3.14, find its circumference.

    18.84 cm

    Circumference C = 2πr = 2 × 3.14 × 3 = 18.84 cm.

  4. 4. A circle has radius 11 cm. Using π = 3.14, find its circumference.

    69.08 cm

    Circumference C = 2πr = 2 × 3.14 × 11 = 69.08 cm.

  5. 5. A circle has radius 20 cm. Using π = 3.14, find its area.

    1256 cm²

    Area A = πr² = 3.14 × 20² = 1256 cm².

  6. 6. A circle has radius 14 cm. Using π = 3.14, find its area.

    615.44 cm²

    Area A = πr² = 3.14 × 14² = 615.44 cm².

  7. 7. A circle has radius 14 cm. Using π = 3.14, find its circumference.

    87.92 cm

    Circumference C = 2πr = 2 × 3.14 × 14 = 87.92 cm.

  8. 8. A circle has radius 15 cm. Using π = 3.14, find its area.

    706.5 cm²

    Area A = πr² = 3.14 × 15² = 706.5 cm².

  9. 9. A circle has radius 5 cm. Using π = 3.14, find its circumference.

    31.4 cm

    Circumference C = 2πr = 2 × 3.14 × 5 = 31.4 cm.

  10. 10. A circle has radius 10 cm. Using π = 3.14, find its circumference.

    62.8 cm

    Circumference C = 2πr = 2 × 3.14 × 10 = 62.8 cm.

  11. 11. A circle has radius 15 cm. Using π = 3.14, find its circumference.

    94.2 cm

    Circumference C = 2πr = 2 × 3.14 × 15 = 94.2 cm.

  12. 12. A circle has radius 8 cm. Using π = 3.14, find its area.

    200.96 cm²

    Area A = πr² = 3.14 × 8² = 200.96 cm².

12 questions · Seed 51 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 16-18

Circle circumference & area

Take your time. Show your thinking.

  1. 1. A circle has radius 20 cm. Using π = 3.14, find its circumference.

    20 cm · 3.14 · Circle circumference & area

  2. 2. A circle has radius 4 cm. Using π = 3.14, find its circumference.

    4 cm · 3.14 · Circle circumference & area

  3. 3. A circle has radius 3 cm. Using π = 3.14, find its circumference.

    3 cm · 3.14 · Circle circumference & area

  4. 4. A circle has radius 11 cm. Using π = 3.14, find its circumference.

    11 cm · 3.14 · Circle circumference & area

  5. 5. A circle has radius 20 cm. Using π = 3.14, find its area.

    20 cm · 3.14 · Circle circumference & area

  6. 6. A circle has radius 14 cm. Using π = 3.14, find its area.

    14 cm · 3.14 · Circle circumference & area

  7. 7. A circle has radius 14 cm. Using π = 3.14, find its circumference.

    14 cm · 3.14 · Circle circumference & area

  8. 8. A circle has radius 15 cm. Using π = 3.14, find its area.

    15 cm · 3.14 · Circle circumference & area

  9. 9. A circle has radius 5 cm. Using π = 3.14, find its circumference.

    5 cm · 3.14 · Circle circumference & area

  10. 10. A circle has radius 10 cm. Using π = 3.14, find its circumference.

    10 cm · 3.14 · Circle circumference & area

  11. 11. A circle has radius 15 cm. Using π = 3.14, find its circumference.

    15 cm · 3.14 · Circle circumference & area

  12. 12. A circle has radius 8 cm. Using π = 3.14, find its area.

    8 cm · 3.14 · Circle circumference & area
12 questions · Seed 51 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 16-18

Circle circumference & area

Answers and reasoning. Review before teaching.

  1. 1. A circle has radius 20 cm. Using π = 3.14, find its circumference.

    125.6 cm

    Circumference C = 2πr = 2 × 3.14 × 20 = 125.6 cm.

  2. 2. A circle has radius 4 cm. Using π = 3.14, find its circumference.

    25.12 cm

    Circumference C = 2πr = 2 × 3.14 × 4 = 25.12 cm.

  3. 3. A circle has radius 3 cm. Using π = 3.14, find its circumference.

    18.84 cm

    Circumference C = 2πr = 2 × 3.14 × 3 = 18.84 cm.

  4. 4. A circle has radius 11 cm. Using π = 3.14, find its circumference.

    69.08 cm

    Circumference C = 2πr = 2 × 3.14 × 11 = 69.08 cm.

  5. 5. A circle has radius 20 cm. Using π = 3.14, find its area.

    1256 cm²

    Area A = πr² = 3.14 × 20² = 1256 cm².

  6. 6. A circle has radius 14 cm. Using π = 3.14, find its area.

    615.44 cm²

    Area A = πr² = 3.14 × 14² = 615.44 cm².

  7. 7. A circle has radius 14 cm. Using π = 3.14, find its circumference.

    87.92 cm

    Circumference C = 2πr = 2 × 3.14 × 14 = 87.92 cm.

  8. 8. A circle has radius 15 cm. Using π = 3.14, find its area.

    706.5 cm²

    Area A = πr² = 3.14 × 15² = 706.5 cm².

  9. 9. A circle has radius 5 cm. Using π = 3.14, find its circumference.

    31.4 cm

    Circumference C = 2πr = 2 × 3.14 × 5 = 31.4 cm.

  10. 10. A circle has radius 10 cm. Using π = 3.14, find its circumference.

    62.8 cm

    Circumference C = 2πr = 2 × 3.14 × 10 = 62.8 cm.

  11. 11. A circle has radius 15 cm. Using π = 3.14, find its circumference.

    94.2 cm

    Circumference C = 2πr = 2 × 3.14 × 15 = 94.2 cm.

  12. 12. A circle has radius 8 cm. Using π = 3.14, find its area.

    200.96 cm²

    Area A = πr² = 3.14 × 8² = 200.96 cm².

12 questions · Seed 51 · Age guidance, not curriculum certification